The left Idle Timeout arrow decreases the time it takes for the screen to dim. The right Idle Timeout arrow increases the time it takes for the screen to dim. When the arrows are tapped, the time decreases or increases in five minute increments.

The default setting is 30 minutes which is the maximum number of Idle Timeout minutes.

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The left Dimming Level arrow decreases the brightness level for automatic dimming. The right Dimming Level arrow increases the brightness level for automatic dimming.

The default Dimming Level is 10 which is the brightest setting.

To have the screen never dim due to inactivity, set the Dimming Level to 10. This also requires that the backlight off at night setting is No. See Setting the Touchscreen to Night Mode for steps to set backlight off at night to No.